I thought I'd ask for some help for this issue that's been puzzling me for a few days. I have a friend's 13" Mid-2009 2.26GHz MacBook Pro he asked me to take a look it. It was loading very slowly and the hard drive was making clicking noises. The first thing I told him was to buy a new hard drive and backup his data, which he did. The issue now is, even after installing a new hard drive, and reinstalling Mac OS X Lion on it, the loading slow issue still persists, basically 10+ minutes to boot. The hard drive works normally (30 second boot) in a USB SATA enclosure however. I've tried cleaning the unit with compressed air to no avail. It also has a clean install of OS X with 8GB of RAM. Any ideas?